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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Chess Game</title>
    <style>
        :root {
            --board-size: min(80vh, 600px);
            --square-size: calc(var(--board-size) / 8);
            --primary-dark: #2c3e50;
            --primary-light: #2d3436;
            --highlight: #f1c40f;
            --move-highlight: rgba(46, 204, 113, 0.4);
            --check-highlight: rgba(231, 76, 60, 0.4);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
            background: var(--primary-dark);
            color: #ecf0f1;
            min-height: 100vh;
            display: flex;
        }

        .container {
            display: grid;
            grid-template-columns: var(--board-size) 300px;
            gap: 2rem;
            margin: auto;
            padding: 2rem;
            background: var(--primary-light);
            border-radius: 1rem;
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }

        .board-container {
            width: var(--board-size);
            height: var(--board-size);
            position: relative;
        }

        .chessboard {
            width: 100%;
            height: 100%;
            display: grid;
            grid-template-columns: repeat(8, 1fr);
            grid-template-rows: repeat(8, 1fr);
            border: 4px solid #2c3e50;
            border-radius: 4px;
            overflow: hidden;
        }

        .square {
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: calc(var(--square-size) * 0.7);
            cursor: pointer;
            transition: all 0.2s;
            position: relative;
            user-select: none;
        }

        .white { background: #e0c48f; }
        .black { background: #b4835a; }

        .square.selected { 
            background: var(--highlight) !important;
        }

        .square.valid-move::after {
            content: 'β€’';
            position: absolute;
            color: rgba(0,0,0,0.3);
            font-size: 2em;
        }

        .square.attack-move::after {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            border: 2px solid rgba(231, 76, 60, 0.6);
            border-radius: 50%;
        }

        .piece {
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: calc(var(--square-size) * 0.7);
            cursor: grab;
        }

        .piece.white { color: #fff; }
        .piece.black { color: #000; }
    </style>
</head>
<body>
    <div class="container">
        <div class="board-container">
            <div class="chessboard" id="board"></div>
        </div>
    </div>

    <script>
        class ChessGame {
            constructor() {
                this.board = this.createInitialBoard();
                this.currentPlayer = 'white';
                this.selectedPiece = null;
                this.initializeBoard();
            }

            createInitialBoard() {
                return [
                    ['r', 'n', 'b', 'q', 'k', 'b', 'n', 'r'],
                    ['p', 'p', 'p', 'p', 'p', 'p', 'p', 'p'],
                    [null, null, null, null, null, null, null, null],
                    [null, null, null, null, null, null, null, null],
                    [null, null, null, null, null, null, null, null],
                    [null, null, null, null, null, null, null, null],
                    ['P', 'P', 'P', 'P', 'P', 'P', 'P', 'P'],
                    ['R', 'N', 'B', 'Q', 'K', 'B', 'N', 'R']
                ];
            }

            initializeBoard() {
                const boardElement = document.getElementById('board');
                boardElement.innerHTML = '';

                for (let row = 0; row < 8; row++) {
                    for (let col = 0; col < 8; col++) {
                        const square = document.createElement('div');
                        square.className = `square ${(row + col) % 2 === 0 ? 'white' : 'black'}`;
                        square.dataset.row = row;
                        square.dataset.col = col;
                        square.onclick = (e) => this.handleSquareClick(e);

                        const piece = this.board[row][col];
                        if (piece) {
                            const pieceElement = document.createElement('div');
                            pieceElement.className = `piece ${piece === piece.toUpperCase() ? 'white' : 'black'}`;
                            pieceElement.textContent = this.getPieceSymbol(piece);
                            square.appendChild(pieceElement);
                        }

                        boardElement.appendChild(square);
                    }
                }
            }

            getPieceSymbol(piece) {
                const symbols = {
                    'P': 'β™™', 'p': 'β™Ÿ',
                    'R': 'β™–', 'r': 'β™œ',
                    'N': 'β™˜', 'n': 'β™ž',
                    'B': 'β™—', 'b': '♝',
                    'Q': 'β™•', 'q': 'β™›',
                    'K': 'β™”', 'k': 'β™š'
                };
                return symbols[piece] || '';
            }

            handleSquareClick(event) {
                const square = event.target.closest('.square');
                const row = parseInt(square.dataset.row);
                const col = parseInt(square.dataset.col);

                const piece = this.board[row][col];

                if (this.selectedPiece) {
                    this.tryMove(row, col);
                } else if (piece && this.isCurrentPlayerPiece(piece)) {
                    this.selectPiece(row, col);
                }
            }

            isCurrentPlayerPiece(piece) {
                return (this.currentPlayer === 'white' && piece === piece.toUpperCase()) ||
                       (this.currentPlayer === 'black' && piece === piece.toLowerCase());
            }

            selectPiece(row, col) {
                this.selectedPiece = { row, col };
                document.querySelectorAll('.square').forEach(sq => sq.classList.remove('selected'));
                document.querySelector(`[data-row='${row}'][data-col='${col}']`).classList.add('selected');
            }

            tryMove(toRow, toCol) {
                const { row, col } = this.selectedPiece;
                this.board[toRow][toCol] = this.board[row][col];
                this.board[row][col] = null;
                this.currentPlayer = this.currentPlayer === 'white' ? 'black' : 'white';
                this.selectedPiece = null;
                this.initializeBoard();
            }
        }

        new ChessGame();
    </script>
</body>
</html>